Arsenobenzene derivatives and process of making same.



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To all whom 'it concern:

Be it known t at we, PAUL EHRLICH,

M. D., professor of medicine, and ALFRED I m, Ph. D, citizens of the Empire of Germany, residing at Frankfort-earthe- Main, Germany, have invented certain'new and useful Improvements in Arsenobenzene Derivatives and Proc of Making Same, of which the following is. a specification. l

We have found that asymmetrical arsenobenzene derivatives,,contammg'a saltforming group of atoms, such as the amino-, h droxyl-, carboxylgroup, can be obtained.

ese new roducts ma be produced by treating wit strong're ucing agents two different aromatic arsenoids, of which at least one contains a salt-forming group of atoms, which are mixed their molecular weights. he reaction which takes place corresponds to the equation:

wherein R and R. mean aromatic radicals different from each other and one of them at least containing a group of atoms capable of forming salts. As the arsenoxids are the products formed first from the arsinic acids by the action of reducing agents, the latter may also be used in the present process in the place of the arsenoxids. Suitable reducing agents, are for instance,

hvdrosulfite, stannous chlorid.

The new com ounds are yellow to yellowieh-brown pow ers. When heated with tin and hydrochloric acid they are split up with formation of two aromatic arsins diffaring from each other. They decompose when heated and are easily altered when exposed to the air, particularl in presence of alkalis. They are solu Is in glasodium amalgam,

cial acetic acid and concentrated sulfuric acid and are of great therapeutical value owing to their bactericidal action upon trypanosomes. l

For preparing an asymmetrical arsenobenzene the procedure may, for instance, be

Specification of Letters Patent. Application filed has 12, 1911." man No. usages.

'driodic acid acting roport-ionally to:

as follows The chlorhydrate fot glycinarsin-dichlorid may! be produced from phenylglycinarsinic aci I 1.1 9) so1ution by the action.oi sulfurousqw acid in presence of a small quantityv of hy-'.

solves in alkalis -forming the-, corresponding 1 phenylglycin-arsenoxid. Therefore 41.6 gr, of the chlorhydrate of the phenylglyc1narsin-dichlorid and 24.9 gr. zo'f 3-aininoloxybenzenearsenoxid are dissolved in-QOQJL;

ccm of methyl alcohol and;this solution is; poured into 500 com. of normalgcausticsodas lye. After having diluted: themass with 2 10. liters of water, 200 gr. of anhydrous sodium hydrosulfite are added to it while well stirring. The previously clear liquid then changes to a thick yellowish-brown magma of the varseno compound. "-Rfter'fl having stirred for about half an hour, theprecipitate is filtered off, washed with .wateinand dried in vacuo. The new phenylglycin-arsenoiifiaminoA oxybenzene i v 9.

l Hun ".lH ""UA"; iii 15 a yellowish-brown powder, insoluble in asymmetrical Patented Feb. 2c 1912." p

a 55; 1 C JHM)mfimmsoai I in a hydrochloric acid gravity LarsenobenZene derivatives containing a salt forming group of atoms; being yellow to yellowish-brown powdersgsoluble in glacial a ceti'c acid and concentrated sulfuric acid, readily altering whenheated and exposed to t-heair, particularly in presence of alkallis, and, when heated with tin and hydrochloric acid, being splitup with formation of two aroniatiearsins; havinga bac- 25,. produ' ct forming when treated with diluted 'CO HGrnNH-C H AR; j

,(NHQOH; being a yellowish-brown powder, soluble in concentrated sulfuric acidrand lacial acetic tericidal action in trypanosomes infections.

2. As a new product, the asymmetrical arsenobenzem derivative, namely the phenylglycin 1 arseno-3-an1ino-4t oxybenzene oi the forniula I As-C $1 iacid, 'nsoluble in water, easily altering when heated, or when exposedflto the air, -pa.rticu-.v g

and the aminooxybenzenearsenoKid;

larly :i n; analkaline solution, andv when 'lieated with-tin and hydrochloric acid being split -i1f) {with formation of phenylglycina'rsin and, aminooxybenzene-arsin said hydrochloric acid and with alkalis, salts f which are readily soluble in water; produc- C6 ctio|t ju Let'tei'ePatent rim-1 ,uj 2,657.

ing :a ci ra tive' eflect' in diseases caused by trypanosomes.

- 3 .}The process of producing asymmetrical arsenoloenzene derivatives, which conslsts in treat ng. with strong reducing molecular proportions and of which at least one contains a salt-forming group of atoms.

4. The process ofproduclng asymetrical arsenobenzene derivatives, which consists in treatingwith strong. reducing agents two aromatic arsenoxids mixed proportionally to their molecular weights, one of which is an aniinooxyarsenoxid.

5. The process of producing asymmetrical arsenobenzene derivatives, which consists in treating with hydros'ulfite two aromatic arsenoxids mixed proportionally to their molecular weights and of which at least one contains a salt-forming group of atoms.

6. The process of producing an asyminetrical arsenobenzene derivative, which conagent's two aromatic arsenoxids mixed in sists in treating with hydrosulfite the phenylglycinarsenoxid. I V

(3 H (4;) NHGI-LCOOH (1) AsO,

-mixed proportionallyflto their molecular weights] r .In testimony whereof, .we aflix our signatures in presenee'of. two witnesses.

it is hereb certified that ill Letters Patent N0.- 1,017,657, granted February 19 1 2, upon the application of Paul Ehrlichand Alfred Bertheim, of- Frankfortjoh the-lrlain, Germany; for an'i nprovement in ""Arsenobenaene Derivatives and I rocesses of M aking sal nefl an error appears in the printed specification requircorrection as follows: Page 1, line 17, fo1' the word arsen oicls readvarseand that'the said Letters Patent should be read with this correction therein i that the same they conform to the record of the case in the Patent Ofiice.

0. c. sinuses.

Actng Umnmz'esloner of Patents.

LarsenobenZene derivatives containing a salt forming group of atoms; being yellow to yellowish-brown powdersgsoluble in glacial a ceti'c acid and concentrated sulfuric acid, readily altering whenheated and exposed to t-heair, particularly in presence of alkallis, and, when heated with tin and hydrochloric acid, being splitup with formation of two aroniatiearsins; havinga bac- 25,. produ' ct forming when treated with diluted 'CO HGrnNH-C H AR; j

,(NHQOH; being a yellowish-brown powder, soluble in concentrated sulfuric acidrand lacial acetic tericidal action in trypanosomes infections.

2. As a new product, the asymmetrical arsenobenzem derivative, namely the phenylglycin 1 arseno-3-an1ino-4t oxybenzene oi the forniula I As-C $1 iacid, 'nsoluble in water, easily altering when heated, or when exposedflto the air, -pa.rticu-.v g

and the aminooxybenzenearsenoKid;

larly :i n; analkaline solution, andv when 'lieated with-tin and hydrochloric acid being split -i1f) {with formation of phenylglycina'rsin and, aminooxybenzene-arsin said hydrochloric acid and with alkalis, salts f which are readily soluble in water; produc- C6 ctio|t ju Let'tei'ePatent rim-1 ,uj 2,657.

ing :a ci ra tive' eflect' in diseases caused by trypanosomes.

- 3 .}The process of producing asymmetrical arsenoloenzene derivatives, which conslsts in treat ng. with strong reducing molecular proportions and of which at least one contains a salt-forming group of atoms.

4. The process ofproduclng asymetrical arsenobenzene derivatives, which consists in treatingwith strong. reducing agents two aromatic arsenoxids mixed proportionally to their molecular weights, one of which is an aniinooxyarsenoxid.

5. The process of producing asymmetrical arsenobenzene derivatives, which consists in treating with hydros'ulfite two aromatic arsenoxids mixed proportionally to their molecular weights and of which at least one contains a salt-forming group of atoms.

6. The process of producing an asyminetrical arsenobenzene derivative, which conagent's two aromatic arsenoxids mixed in sists in treating with hydrosulfite the phenylglycinarsenoxid. I V

(3 H (4;) NHGI-LCOOH (1) AsO,

-mixed proportionallyflto their molecular weights] r .In testimony whereof, .we aflix our signatures in presenee'of. two witnesses.

it is hereb certified that ill Letters Patent N0.- 1,017,657, granted February 19 1 2, upon the application of Paul Ehrlichand Alfred Bertheim, of- Frankfortjoh the-lrlain, Germany; for an'i nprovement in ""Arsenobenaene Derivatives and I rocesses of M aking sal nefl an error appears in the printed specification requircorrection as follows: Page 1, line 17, fo1' the word arsen oicls readvarseand that'the said Letters Patent should be read with this correction therein i that the same they conform to the record of the case in the Patent Ofiice.

0. c. sinuses.

Actng Umnmz'esloner of Patents.

Gorrectldn in Letters Patent l 1,017,657.

It is hereby certified that in Letters Patent No. 1,017,657, granted February 20, 1912, upon the application of Paul Ehrlich and Alfred Bertheim, of Frankforton-the-Main, Germany," for an improvement in Arsenobenzene Derivatives and Processes of Making Sarne. an error appears in the printed specification requiring correction as follows: Paige 1, line 17, for the word arscnoids read arse noapid; and that the said Letters Patent should he read with this correction therein that the same may conform to the record of the case in the Patent Oflice.

Signed and sealed this 11th day of June, A. 15., 1912.

C. C. BILLINGS,

Acti/ng Chmmzlm'oner of Patents.

[SEAL] 

